Fire-alarm.



E. E. FRYBERG.

FIRE ALARM.

APPLICATION FILED MAR. 16. 1914.

mmmm Patented July 6,1915.

WITNESSS i so ELMER E. I FRYBERG, OF DULUTH, MINNESOTA, ASSIGNOR OFONE-THIRD TO LOUIS BERGLUND AND ONE-THIRD T JOHN CARLSON, BOTH 0FDULUTH, MINNESOTA.

FIRE-ALARM.

Mamas;

Specification of Letters Patent.

Patented July 6, 1915.

T0 all whom it mag concern Be it known that I, ELMER E. FRYBERG,

' a citizen of the United States,residing at Duluth, in the county ofSt. Louisand State of- Minnesota, have 'invented certain new and usefulImprovements in Fire-Alarms,

of which the following is a specification, reference being. had thereinto the accompanying drawing.

My invention relates to improvements in ,fixealarms, the primary Objectof which is to provide an alarm which is operated by the heat or flamesfrom the fire.

D hotels, apartments, etc, where'noticeof fire.

i-An'other object of the present improvementisto devise an alarm which,set by the flames .or heat from the fire, will communi- -cate an alarmthrough a telephone system.

The device is especially adapted for use in noted objects which is bothsimple, cheap and durable. l

In the accompanying drawings: Figure '1 is a top plan view, partlybroken away of my improved fire alarm. Fig. 2 is a side ele-' vation ofmy improved alarm shown con.-

nected with a telephone circuit.

Referring now to the drawings in which.

like numerals designate similar parts, 1 represents the base of thealarm mechanism and is preferably constructed of'metal or some materialwhich is not quickly inflammable. Upon one end of this base is mounteda'spring actuated bell 2 which is of the common door -'bell design,wherein the bell is actuated by means of a spring 3 mounted upon asupporting stem 4, the bell having a forms of a bell would answer thesame purpose, but for simplicity I prefer to use the one illustrated,the construction of which 1s well known.

Adjacent the bell and fixed to the base is V an inverted U-shaped staple6 pivotally carrying about its projectin body portion a spiral spring 7,the short hbrizontal end 8 of which normally engages the under edge 9 ofthe bell. When the bell is thus engaged by the end 8 it is preventedfrom being re-- volved by the action of the spring 3. The posltivenessof this engagement may be en hanced, if'found necessary, by forming anotch in the edge of the bell for the receplZlOIl of the end 8 of thespring. However, 1f the directcontact is found sufficient to hold thehell, no notches are necessary. The opposite end or arm 10 of the springextends upwardly at approximatelyright angles to the end 8 and to adistance about even with the top of the bell.

A somewhat similar appearing member 11 1s fixed stationary to the base 1and is spaced apart from the spring arm 10. The upper free ends of boththe arm 10 and the member 11 are normally connected by a short piece offuse wire 12 having preferably suspended therefrom, in any suitableform, an

inflammable substance 13 such as cotton,

pa er or the like.

n upper projecting rigid top or keeper 14 is fixed to the base 1,intermediate the spring 7 and the bell 2. This keeper 14 has when thearm 10 of the spring flies back toward the bell, released by the burningof the fusible material, it will be caught in the bifurcated mouth ofthe keeper and be held therein until manually removed.

It is to be understood that this device is shown in its simplest form inFig. 1, and is intended for use in any place where fire may be expectedto occur and where the ringing of a bell might attract attention.

The operation of the device is as follows: The bell 2 is first wound up.The arm 10 of the spring 7 is drawn away from the bell with sullicientforce to cause the end 8 thereof to forcibly impinge the under edge ofthe bell 2 and prevent it from revolving. The fuse wire 12 is thenconnected to the upper ends of the standard 11 and the arm 10 whichholds them normally in the position illustrated in the drawings. As soonas a flame or extreme heat effects a sever-- ing of the fuse 12, thespring arm 10 will snap into the keeper 15 and be held therein while thehell 2 is free to revolve and be sounded by the clapper 5 during the ex:pansion of the spring. The inflammable substance 13 may or may not beemployed as desired, for the reason that the soft fuse 12 is of suchconsistency as to be readily disintegrated by heat.

My manner of attaching the above described alarm mechanism to atelephone system is shown in Fig. 2 of the drawing. A wire 16 is ledfrom one of the telephone wires 17 to the U-shaped support 6 of thespring 7. Another wire 18 leads from the wire 19 of the telephonecircuit to one pole of a suitable solenoid 20 located adjacentthetelephone box 21. The opposite pole 22 of the solenoid 20 isconnected by a suitable wire to the keeper 14; of the alarm mechanism. Areciprocating core 28 is placed within the solenoid 20, the dependingarm of which is hooked under the receiver arm 25 of the telephone as at24. This connection in no wise interferes with the free and customaryaction of the arm 25 when manipulated by the receiver 26. ln ope rsrtion should the alarm be set off by heat or flame as has been abovedescribed, the electric circuit between the telephone wire, which isalways alive, and the solenoid will be instantly closed. This closing ofthe circuit will cause the core 23 to rise and lift with it the receiverarm 25 of the telephone, carrying. with it the receiver. It is evidentthat this movement of the receiver arm will call central and allow thedistinct hearing of the buzzing of the bell which is adjacent thetelephone. Central can then turn in a general alarm.

It is evident how admirable the device is adapted for hotels orapartmentswhere it may be installed in conjunction with any telephonesystem.

Having thus fully described my invention what I claim and desire tosecure by Letters Patent is:

An alarm mechanism comprising a base, a mechanically operated bellmounted thereon, a catch engaging the bell and preventing it fromsounding, the said catch held by a fusible connection between it and thebase, a keeper for the catch when it has been re leased, a telephoneinstrument, a solenoid 'having its core engaging the receiving arm ELMERE. FRYBERG. Witnesses W. H. DENI-IAM, S. Gno. STEVENS.

